mercurial/cmdutil.py

--- a/mercurial/cmdutil.py	Mon Jun 13 21:30:14 2016 +0100
+++ b/mercurial/cmdutil.py	Tue Jun 14 11:05:36 2016 +0100
@@ -2147,7 +2147,7 @@
     if opts.get('rev'):
         # User-specified revs might be unsorted, but don't sort before
         # _makelogrevset because it might depend on the order of revs
-        if not revs.isdescending():
+        if not (revs.isdescending() or revs.istopo()):
             revs.sort(reverse=True)
     if expr:
         # Revset matchers often operate faster on revisions in changelog